Which sentence must be revised to eliminate the preposition at the end?

In A, “on” is left at the end of the sentence. Revise it to “The museum had the throne on which the king sat,” placing the preposition before “which.” B and C also end in prepositions, but the question asks which sentence must be revised; grammatically, both do end with prepositions. D ends with “before,” which functions as an adverb here, not a preposition. Since A, B, and C all have ending prepositions, the question has more than one correct answer as written.

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